NSN and South Korean Operators Achieve TDD-FDD Carrier Aggregation
Published on: 24th Feb 2014
By: Ian Mansfield
Nokia Solutions and Networks (NSN) has announced its successful demonstration of the world's first TDD FDD carrier aggregation together with Korean operators Korea Telecom (KT) and SK Telecom (SKT).
By aggregating spectrum resources on multiple frequency bands of TD-LTE and FDD LTE, NSN helps operators increase throughput by 50-100%, depending on the level of availability of TDD or FDD spectrum.
"It gives us immense satisfaction to achieve the world's first TDD-FDD carrier aggregation, and we are actively pursuing the 3GPP standardization of the technology," said Qi Zhang, vice president of TD-LTE at NSN.
With carrier aggregation, operators can, for example, combine their low-frequency FDD bands such as 850 MHz and 900 MHz with high-frequency TDD bands such as 2300 MHz and 2600 MHz in order to provide high-speed mobile broadband in large areas. High-frequency bands are typically uplink limited and have less coverage.
In the case of TDD-FDD carrier aggregation, however, operators can improve their high-frequency band TD-LTE coverage by 50-100% using TDD for downlink only and using the lower-frequency FDD for uplink as well as downlink. This increase in TD-LTE coverage thus provides a larger "high- capacity LTE" coverage area.
In addition, TDD-FDD carrier aggregation allows load balancing between TD-LTE and FDD LTE networks. This ensures seamless mobile broadband coverage and optimal speed for all subscribers of TD-LTE and FDD LTE networks, and optimizes the utilization of both bands for a quick return on investment for operators.